homing using limit switch and axis encoder z channel

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benscale160
Posts: 22
Joined: Fri Apr 13, 2018 8:29 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC11: No
CPU10 or CPU7: No
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homing using limit switch and axis encoder z channel

Post by benscale160 »

I am about to install an allin1 board on a clients machine. I would like to know if there is a way to employ the use of the z channel (one pulse per rev) on the axis encoder to repeatably home the machine after coming off of a limit switch. Marty did a similar thing with the acorn and a dmm servo on an emco lathe. In his case I believe he had to use 6 inputs on the board, 3 for the limit switches and 3 for the encoder inputs. In the case of the allin1 board, the encoder is already connected to the board and read by the computer so the use of additional inputs to read the decoder will probably not be needed. I'm sure a custom program may need to be written in the homing file.

Thanks in advance,
Ben
cncsnw
Posts: 1605
Joined: Wed Mar 24, 2010 5:48 pm

Re: homing using limit switch and axis encoder z channel

Post by cncsnw »

That is normal behavior with closed-loop controls such as the Allin1DC. You don't need to do anything special; just be sure to use plain "M91..." or "M92...", instead of "M91... L1" or "M92... L1".

Special measures are needed only on the Acorn, because it lacks encoder feedback.
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